GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 2WD 🢒 Body and Accessories 🢒 Stationary Windows 🢒 Automatic Day-Night Mirrors System Check

Automatic Day-Night Mirrors System Check Temperature

Table 1: Outside Air Temperature Sensor, Temperature and Resistance Table

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn ignition to the run position.
  2. Toggle between compass and temperature setting on mirror.
  3. Check compass/temperature display.

Mirror display alternates between compass and temperature readings.

Mirror Compass Display Inoperative or Inaccurate

2
  1. Position vehicle outside away from buildings, antenna towers, etc...
  2. Exit vehicle and with a known good compass, take a reading in which the vehicle is headed.
  3. Toggle the mirror display to the compass position.
  4. Note compass reading in mirror display.

Mirror display shows same heading as known good compass.

Mirror Compass Display Inoperative or Inaccurate

3
  1. Exit vehicle and with a known good thermometer, take an outside temperature reading.
  2. Toggle the mirror display to the temperature position.
  3. Note temperature reading in mirror display.

Mirror display shows same reading as known good thermometer

Mirrors - Temperature Inoperative or Inaccurate

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.

Outside Air Temperature Sensor, Temperature and Resistance Table

°C

°F

MIN. OHMS

MAX. OHMS

-20

-4

9.46k

9.94k

-15

5

7.12k

7.45k

-10

14

5.42k

5.64k

-5

23

4.14k

4.31k

0

32

3.20k

3.33k

5

41

2.49k

2.58k

10

50

1.96k

2.01k

15

59

1.54k

1.59k

20

68

1.23k

1.26k

25

77

0.98k

1.01k

30

86

0.79k

0.81k

35

95

0.64k

0.66k

40

104

0.52k

0.53k

45

113

0.43k

0.44k

Automatic Day-Night Mirrors System Check Mirror

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Place transmission in park.
  2. Turn ignition switch to the RUN position.
  3. Cover ambient light sensor (windsheild side) with a dark cloth.
  4. Shine a light at headlamp sensor (mirror side).

All mirrors gradually darken.

2

Place gear selector in reverse.

All mirrors gradually lighten to clear state.

Mirrors - Automatic Day-Night Inoperative in Reverse

3

Place gear selector in park.

All mirrors gradually darken.

Outside Mirrors Automatic Day-Night Feature Inoperative

4

Remove the light and the cloth.

All mirrors gradually lighten to clear state.

Outside Mirrors Automatic Day-Night Feature Inoperative

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.